EnergyPlus · May 2026

Cheapest electricity tariff for a flat in the UK (May 2026)

A typical UK flat uses much less electricity than a house, which makes the cheapest tariff genuinely different. From 1 April 2026 every supplier on the default tariff must offer a zero-standing-charge electricity variant under Ofgem's new mandate — and that's the cheapest option for many flats that sit below the break-even of around 1,800–2,200 kWh a year. This page shows the cheapest tariff for each flat profile in May 2026, with the break-even maths so you switch to a deal that actually saves you money.

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Editorial information, not financial advice. Prices and policy can change — always confirm against the supplier and Ofgem.

Cheapest flat electricity tariff — May 2026 at a glance

Single-occupancy gas-heated flat under ~1,800 kWh/year: the new zero-standing-charge variant (mandated April 2026) usually wins. Couple gas-heated flat (~2,000–2,400 kWh): a 12-month single-rate fix at 2–6% below the April–June 2026 cap usually wins. All-electric flat with storage heaters: Economy 7 on a fix wins. Smart-meter flats with shiftable load (laundry, dishwasher, EV): a time-of-use tariff (Agile, Pulse, Cosy) can beat everything.

Quick checklist (May 2026):

  • Under ~1,800–2,200 kWh/year: zero-standing-charge variant is cheapest.
  • 2,000–2,400 kWh single-rate flats: 12-month single-rate fix is cheapest.
  • Storage-heater flats: Economy 7 fix beats single-rate by 10–25% on annual cost.
  • SMETS2 + shiftable load: time-of-use tariffs can beat the zero-standing-charge variant.
  • Always run annual cost = unit rate × kWh + standing charge × 365.
Last updated
May 2026
Reviewed by
Energy Specialist
Audience
UK households & small businesses

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Annual kWh

Drives the unit-rate portion of your bill.

Meter type

Single-rate, Economy 7/10, smart, half-hourly all price differently.

Postcode & region

Standing charges and tariff availability vary by network region.

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Fixes of 12/18/24/36 months trade certainty for flexibility.

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Cheapest electricity tariff for a UK flat in May 2026

A clear, current overview to help you choose with confidence.

Flats are low-use customers

Ofgem's typical domestic consumption values benchmark a low-use single-occupancy home at ~1,800 kWh of electricity a year, climbing to ~2,400 kWh for medium use. Both sit at or below the no-standing-charge break-even, which is why flats are the group most likely to win from the April 2026 Ofgem mandate.

The no-standing-charge maths

The zero-standing-charge variant trades the daily standing charge for a higher unit rate (roughly 7–11p/kWh above the cap unit rate). Break-even = (standing charge × 365) ÷ (unit rate premium). On May 2026 figures that's ~1,800–2,200 kWh/year. Below that, no-standing-charge wins; above it, a standard tariff is cheaper.

Storage-heater flats need Economy 7

Storage heaters charge overnight on the cheap rate and release heat through the day. For any flat where overnight use is >30% of total, Economy 7 beats single-rate. May 2026 Economy 7 night rates sit at roughly 9–14p/kWh depending on region — well below the cap unit rate.

Time-of-use for smart-meter flats

Octopus Agile, E.ON Next Pulse and Cosy Octopus only work on SMETS2 meters. They give very cheap off-peak windows (sometimes sub-5p/kWh on Agile) but charge above cap at peak times. For flats with shiftable load — laundry, dishwasher, EV charging — they often beat both the no-standing-charge variant and a single-rate fix.

Compare like-for-like

Indicative May 2026 view by flat type. Use the form on this page for a personalised comparison.

What to compare Typical range (May 2026) Notes
Default tariff cap (Apr–Jun 2026) Reference baseline Cap unit rate + standing charge — the floor on standard variable tariffs.
Zero-standing-charge variant Unit rate ~7–11p above cap, no daily charge Cheapest for flats under ~1,800–2,200 kWh/year. Mandated April 2026.
12-month single-rate fix ~2–6% below cap on typical use Cheapest for typical 2,000–2,400 kWh single-rate flats.
Economy 7 fix Day rate near cap, night rate ~9–14p/kWh Cheapest for storage-heater flats with overnight load. Needs E7 meter.
Time-of-use (Agile, Pulse, Cosy) Sub-cap off-peak, above cap at peak Best for SMETS2 flats with shiftable load. Needs price-aware usage.

How to pick the cheapest electricity tariff for a flat (May 2026)

  1. 1. Find your annual kWh

    Use last year's bill or your supplier app — the most recent 12 months of electricity.

  2. 2. Identify your meter type

    Single-rate, Economy 7 or SMETS2 — your meter limits which tariffs you can switch to.

  3. 3. Calculate the no-standing-charge break-even

    Break-even kWh = (your daily standing charge × 365) ÷ (zero-SC unit rate − cap unit rate). Below that, no-standing-charge wins.

  4. 4. Match tariff to profile

    Below break-even: zero-standing-charge variant. Typical use single-rate: 12-month fix. Storage heaters: Economy 7. SMETS2 + shiftable: time-of-use.

  5. 5. Run a whole-of-market comparison

    Use the form on this page — it surfaces every option for your postcode.

  6. 6. Apply and submit a meter read

    Switching takes 5 working days. Submit an opening meter read on day one (both registers for Economy 7).

Common pitfalls to avoid

The most frequent issues we see when households and businesses act on what looks like a good deal.

  • Picking the zero-standing-charge variant above the ~1,800–2,200 kWh break-even — you'll pay more.
  • Switching a storage-heater flat off Economy 7 to single-rate — your overnight kWh gets billed at the higher day rate.
  • Using national-average electricity use (~2,700 kWh) as your benchmark — flats are typically well below.
  • Assuming smart-meter time-of-use tariffs always win — they need you to actually shift load to off-peak.
  • Forgetting Ofgem's April 2026 mandate covers electricity only — gas standing charges are unchanged.

Frequently asked questions

What's the cheapest electricity tariff for a flat in May 2026?

It depends on annual kWh and meter type. Below ~1,800 kWh/year the zero-standing-charge variant (mandated April 2026) usually wins. Typical 2,000–2,400 kWh single-rate flats win with a 12-month single-rate fix at 2–6% below the April–June 2026 cap. Storage-heater flats win with Economy 7. SMETS2 flats with shiftable load can win with a time-of-use tariff.

How do I know if no-standing-charge is cheaper for my flat?

Look at last year's electricity kWh on a bill or your in-home display. On May 2026 rates the break-even sits at roughly 1,800–2,200 kWh a year. Below that, no-standing-charge is usually cheaper; above it, a standard tariff with the daily standing charge is cheaper.

Are no-standing-charge tariffs always cheaper for flats?

Only for very low-use flats. The trade-off is a higher unit rate of roughly 7–11p/kWh above the cap unit rate. An all-electric flat using 4,000+ kWh/year is well above the break-even and pays more on a no-standing-charge variant than on a standard tariff.

Should my flat be on Economy 7?

Only if you have storage heaters or you genuinely shift large loads (EV charging, laundry) to overnight. If most of your use is daytime, a single-rate fix is cheaper than Economy 7.

What's the cheapest electricity for an all-electric flat?

All-electric flats typically use 3,500–7,000 kWh/year, which puts them above the no-standing-charge break-even. The cheapest option is usually a 12-month single-rate fix at 2–6% below cap, or Economy 7 if you have storage heaters.

Can I switch electricity supplier if I rent the flat?

Yes — as the named bill-payer you have the right to switch, even in a rented flat, unless your tenancy specifies otherwise. You don't need landlord permission for a supplier switch (you do for meter changes).

How long does switching take?

Five working days under the Faster Switching guarantee. You don't lose supply at any point and there's a 14-day cooling-off period after applying.

What if my flat is on a landlord sub-meter?

Then your tariff is set by your landlord under Heat Networks Act 2023 rules, not by the supplier. The cheapest direct-supply tariffs in this guide apply only once your flat has its own electricity supply contract.

Trust, methodology and sources

Page governance

Reviewed by
Energy Specialist
Last updated
May 2026

How we keep this page current

We refresh this page each month against the latest Ofgem cap, supplier tariff changes and current scheme guidance. Worked numbers are illustrative; quotes you receive via the comparison form are personalised to your meter and postcode.

Editorial independence: our priority is clarity and like-for-like comparison. Where commercial relationships exist, options are still presented on suitability and the information available at the time.

Reputable UK sources we reference

If you spot anything that looks out of date (a rule change, a new scheme), please contact EnergyPlus so we can review and update this page.

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Updated on 30 May 2026